Heating system for dish washing machine

Abstract

The utility model discloses a heating system for a dish-washing machine, which comprises a drying system and a control system, and the drying system comprises a heat pump system, a PTC (Positive Temperature Coefficient) heater and a heat exchange device. And the PTC heater is arranged at the interlayer of the air inlet of the drying chamber. The heat exchange device is arranged in the water tank and makes heat conduction contact with water in the water tank. And the control system comprises a controller, an electric heating wire, a sensor and a fan. The sensor comprises a sensor placing rod arranged in the water tank, at least two temperature sensors and a capacitive water level sensor are sequentially arranged on the placing rod from top to bottom, a pressure type water level sensor is further arranged at the bottom of the water tank, and the sensor further comprises a temperature sensor arranged in the air duct. And the PTC heater, the electric heating wire, the sensor and the fan are all electrically connected to the controller. According to the commercial dish washing machine, quick drying can be carried out, energy consumption is reduced, more practical scenes are met, temperature measurement is more accurate, and scale can be automatically cleaned.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of dish washer, specifically relates to a heating system for dish washer. BACKGROUND

[0002] Firstly, the heat pump drying technology has been widely used in commercial dishwashers due to its high efficiency, energy saving and low temperature drying characteristics. However, heat pump drying also has the limitation of being unable to dry quickly: the drying speed is slow, and the heat pump drying mainly transfers heat from the outside to the inside through the heat exchange system, and the drying temperature is usually controlled at about 60℃ to avoid damage to the tableware. Although this low-temperature drying method is energy-saving, it takes a long time to dry, usually 40 minutes to 2 hours. And it cannot meet the high intensity demand. In commercial scenarios, the demand for tableware cleaning is large and frequent, and the slow characteristics of heat pump drying may lead to a decrease in cleaning efficiency, and cannot meet the rapid drying demand during peak hours.

[0003] Secondly, scale is also a common problem in commercial dishwashers. The effects of scale on dishwashers include but are not limited to: reducing heating efficiency, scale adhering to the surface of the heating pipe, hindering heat transfer, leading to prolonged heating time and increased energy consumption. Affecting cleaning effect, scale may block the water spray holes of the spray arm, reducing the coverage and pressure of the water flow, resulting in incomplete cleaning of tableware. Shorten the service life of the equipment, and the accumulation of scale may cause local overheating of the heating pipe, and even damage the equipment.

[0004] In view of the above problems, the utility model is proposed, and a commercial dishwasher heating system capable of rapid drying and automatic scale cleaning is provided. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, provide a heating system for a dishwasher, which can rapidly dry, save energy, meet more practical scenarios, measure temperature more accurately, and automatically clean scale for a commercial dishwasher.

[0006] The technical scheme adopted by the utility model to solve the existing problems is:

[0007] A heating system for a dishwasher, comprising a drying system and a control system, wherein the drying system comprises a heat pump system, a PTC heater and a heat exchange device; the PTC heater is arranged at the interlayer of the air inlet of the drying chamber; the heat exchange device is arranged in the water tank and is in heat transfer contact with the water in the water tank;

[0008] The control system comprises a controller, heating wires, sensors and a fan, the heating wires are arranged in a spiral shape on the outside of the water tank in an order from top to bottom, and the number of the heating wires is not less than two; the sensors comprise a sensor placing rod arranged in the water tank, at least two temperature sensors and a capacitive water level sensor arranged on the placing rod in an order from top to bottom, and a pressure type water level sensor arranged at the bottom of the water tank, and a temperature sensor arranged in the air duct; the PTC heater, the heating wires, the sensors and the fan are electrically connected to the controller.

[0009] Preferably, the heat pump system comprises an evaporator, a stop valve, a compressor, a condenser and a throttling device connected in sequence, and connected through refrigerant pipes two by two; the heat pump system is arranged in the air supply pipeline of the dishwasher according to the evaporator and the compressor, the fan is arranged at the pipeline opening of the air supply pipeline, and an opening and closing door is arranged at the pipeline opening.

[0010] Preferably, a support is fixed to the inner bottom end of the water tank, and a stirring device is arranged on the support, the stirring device is connected with a control motor, and the control motor is electrically connected to the controller.

[0011] Preferably, the water tank is made of a heat-conducting material; and the heating wires are wrapped with a heat-insulating material and a high-temperature-resistant protective material.

[0012] Preferably, a filter is arranged at the water inlet of the water tank, and a descaling agent feeding mechanism is arranged on the upper side of the water tank.

[0013] Preferably, the water inlet of the dishwasher is connected to the water inlet of the water tank, the water outlet of the water tank is connected to the water pump and the water inlet of the spray arm of the dishwasher, and the drain outlet of the dishwasher is connected to the water outlet of the spray pool.

[0014] Preferably, a high-temperature-resistant rubber damping pad is arranged between the stirring device and the support.

[0015] Preferably, the air outlet of the drying chamber of the dishwasher is connected to the air inlet of the heat exchange device, the air outlet of the heat exchange device is connected to the air inlet of the air duct, and circulation is formed.

[0016] Preferably, the descaling agent feeding mechanism comprises a moisture-proof storage bin arranged on the upper layer, the upper end of the storage bin is connected to the feeding opening of the dishwasher shell, a rotary feeding disc is arranged below the storage bin, and a one-way valve is arranged at the connecting channel of the descaling agent feeding mechanism and the water tank.

[0017] Compared with the prior art, the dishwasher has the beneficial effects that:

[0018] The application is installed with a PTC auxiliary hot air drying function. The PTC heater can provide high-temperature hot air in a short time, significantly shortening the drying time and meeting the high-intensity and high-frequency cleaning needs in commercial scenarios. Compared with traditional heat pump drying, PTC auxiliary drying is more suitable for peak periods and can improve overall efficiency.

[0019] The application recycles the waste heat after drying for water tank heating, reduces the dependence on the main heating system, reduces energy consumption, and significantly reduces operating costs. Shortening the heating time improves cleaning efficiency.

[0020] The descaling mechanism of the application can periodically clean the scale deposited on the waterway, reduce the deposition of scale on the inner wall of the heating pipe and water tank, avoid equipment damage, and prolong the service life of the equipment. It can also improve the cleaning effect, prevent scale from blocking the spray arm and pipeline, ensure uniform water flow coverage on the surface of tableware, and improve the cleaning effect. At the same time, it reduces equipment failures and maintenance frequency caused by scale, and reduces operating costs.

[0021] The application has significant advantages in energy efficiency, cleaning effect, equipment life, and operating cost. The application not only improves the performance of the equipment, but also provides a more economical, environmentally friendly, and reliable cleaning solution for users, suitable for high-intensity and high-frequency commercial scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model is further described below in combination with the drawings and examples.

[0023] Fig. 1 A heating system structure schematic diagram for a dishwasher of the utility model,

[0024] Fig. 2 A gas path flow direction schematic diagram of a heating system for a dishwasher of the utility model.

[0025] In the figure: 1 spray chamber, 2 drying chamber, 3 water tank, 4 storage bin, 5 heating wire, 6 sensor placement rod, 7 heat exchange device, 8 stirring device, 9 opening and closing movable door, 10 fan, 11 evaporator, 12 compressor, 13 condenser, 14 controller, 15 PTC heater. DETAILED DESCRIPTION

[0026] Certain terminology can be used in the specification and claims to refer to particular components. As one skilled in the art will appreciate, manufacturers can refer to a component by different names. This document does not intend to distinguish between components that differ in name but not in function. In the description and in the claims of the application, "including" and like terms are used to mean "comprising," and thus should be interpreted to be equivalent to the term "comprising" as defined above. "Substantially" does not mean "exactly" or "perfectly," but rather "as good as it gets" in light of the technical problem to be solved.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The present application is a kind of heating system for a dishwasher, which will be described in detail below with reference to the accompanying drawings. Figs. 1-2 The present application is a kind of heating system for a dishwasher, which will be described in detail below with reference to the accompanying drawings.

[0030] A kind of heating system for a dishwasher, including drying system and control system.

[0031] The drying system includes a heat pump system, a PTC heater and a heat exchange device 7. The drying mode provided in the present application includes normal mode and fast drying mode. When the normal mode is selected, drying is performed by the heat pump system, and the PTC heater is in the closed state; when the fast drying mode is selected, hot air drying heating is performed by the PTC heater.

[0032] The heat pump system includes an evaporator 11, a stop valve, a compressor 12, a condenser 13 and a throttling device connected in sequence, and connected by refrigerant pipes between each other. The evaporator 11 and the compressor 12 of the heat pump system are arranged in the air supply duct of the dishwasher, the fan 10 is arranged at the duct opening of the air supply duct, and the opening and closing movable door 9 is also arranged at the duct opening.

[0033] The openable movable door 9 is provided with a movable shaft on one side, and the movable shaft is connected with a motor for driving the movable door. A waterproof rubber strip is arranged on the side of the movable door. The openable movable door 9 mainly covers the air duct when the dishwasher is not used, so as to avoid water vapor from entering and affecting the normal use of the dishwasher.

[0034] The PTC heater is arranged at the interlayer of the air inlet of the drying chamber 2. When the rapid drying function is used, the movable door is opened, the fan 10 is started to send air, and the PTC is started to heat, so as to dry the dishes in the drying pool by hot air, and the wet hot air is recovered from the air outlet to utilize the residual heat. The heat exchange device 7 is arranged in the water tank 3 and is in heat conduction contact with the water in the water tank 3, and is used for heating the water in the water tank 3.

[0035] When the normal mode is selected, the heat pump system works, the evaporator 11 absorbs heat from the air, high-temperature and low-pressure gas is formed in the evaporator 11, the high-temperature and low-pressure gas enters the compressor 12 to output high-temperature and high-pressure gas, the high-temperature and high-pressure gas releases heat in the condenser 13 to form hot air for drying, and the high-temperature and high-pressure gas returns to the evaporator 11 after being reduced in pressure by the throttling device.

[0036] The spray chamber 1 and the drying chamber 2 of the dishwasher are connected through a channel, the high-temperature steam after washing in the spray chamber 1 is guided to the exhaust port of the drying chamber 2, and the high-temperature steam is used for residual heat utilization to heat the washing water in the water tank 3.

[0037] The control system includes a controller 14, heating wires 5, sensors, and a fan 10. The number of the heating wires 5 is not less than 2, and the heating wires 5 are arranged in sequence from top to bottom on the outside of the water tank 3 and are arranged in a spiral shape. The design of multiple groups of heating wires 5 can adjust the required heating wires 5 and the current and voltage values of the electric heater according to the amount of water. The heating wires 5 are wrapped with heat insulation material and high-temperature resistant protective material outside. The water tank 3 is made of heat-conducting material.

[0038] The sensors include a sensor placing rod 6 arranged in the water tank 3, at least two temperature sensors and capacitive water level sensors arranged in sequence from top to bottom on the placing rod, and a pressure type water level sensor arranged at the bottom of the water tank 3. The sensors also include a temperature sensor arranged in the air duct. Multiple water level sensors cooperate to obtain more accurate water level values.

[0039] The PTC heater, the heating wires 5, the sensors, and the fan 10 are electrically connected to the controller 14. The controller 14 is the core component of the heating system of the whole dishwasher, connects various sensors, obtains the current temperature of the water tank 3 and the air duct, compares with the set threshold value, judges whether it is consistent, and adjusts accordingly if it is not consistent.

[0040] At the same time, the controller 14 is connected with a WI FI module, and data information is sent to a matched mobile phone software through the WI FI module, and the current heating system operation and working state can be viewed in real time through the mobile phone software.

[0041] A support is fixed to the inside bottom end of the water tank 3, and a stirring device 8 is arranged on the support, the stirring device 8 is connected with a control motor, and the control motor is electrically connected to the controller 14. A high-temperature-resistant rubber damping pad is arranged between the stirring device 8 and the support. The damping pad avoids the vibration of the stirring device 8 from being transmitted to the water tank 3, thereby avoiding unnecessary vibration of the water tank 3. The stirring device 8 avoids the temperature detection error caused by the non-uniform temperature in the water tank 3, and balances the temperature in the water tank 3 by starting the stirring device 8. After the descaling agent is put in, the stirring device 8 fully dissolves the descaling agent, so that the descaling agent can play the maximum effect.

[0042] A filter is arranged at the water inlet of the water tank 3, which is used for filtering impurities in water, thereby avoiding the impurities from being accumulated in the water tank 3 and affecting the normal use of the dishwasher. A descaling agent feeding mechanism is arranged on the upper side of the water tank 3. The descaling agent feeding mechanism specifically comprises a moisture-proof storage bin 4 arranged on the upper layer, the upper end of the storage bin 4 is connected to a feeding opening of the dishwasher shell, a rotary feeding disc is arranged below the storage bin 4, and a one-way valve is arranged at the connecting channel of the descaling agent feeding mechanism and the water tank 3. The descaling agent in the storage bin 4 falls into the water tank 3 for dissolution through the rotation of the rotary feeding disc.

[0043] When the heating system is connected with the dishwasher, the specific installation and connection mode is as follows: the water inlet of the dishwasher is connected to the water inlet of the water tank 3, the water outlet of the water tank 3 is connected to a water pump and connected to the water inlet of a spraying arm of the dishwasher. The water outlet of the dishwasher is connected to the water outlet of the spraying pool. The air outlet of the drying chamber 2 of the dishwasher is connected to the air inlet of the heat exchange device 7, and the air outlet of the heat exchange device 7 is connected to the air inlet of an air duct, thereby forming a circulation.

[0044] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of the ordinary skill in the art without departing from the purpose of the utility model.

Claims

1. A heating system for a dishwasher, characterized in that, The drying system comprises a heat pump system, a PTC heater and a heat exchange device (7); the PTC heater is arranged at the interlayer of the air inlet of the drying chamber (2); the heat exchange device (7) is arranged in the water tank (3) and is in heat conduction contact with the water in the water tank (3); The control system comprises a controller (14), heating wires (5), sensors and a fan (10); the number of the heating wires (5) is not less than two, which are arranged in sequence from top to bottom outside the water tank (3) and are arranged in a spiral shape; the sensors comprise a sensor placement rod (6) arranged in the water tank (3), at least two temperature sensors and capacitive water level sensors arranged in sequence from top to bottom on the placement rod, and a pressure type water level sensor arranged at the bottom of the water tank (3); the PTC heater, the heating wires (5), the sensors and the fan (10) are electrically connected to the controller (14).

2. The heating system for a dishwasher according to claim 1, wherein The heat pump system comprises an evaporator (11), a stop valve, a compressor (12), a condenser (13) and a throttling device connected in sequence and connected through refrigerant pipes; the evaporator (11) and the compressor (12) of the heat pump system are arranged in the air supply pipeline of the dishwasher, and the fan (10) is arranged at the pipeline opening of the air supply pipeline; an opening and closing door (9) is further arranged at the pipeline opening.

3. The heating system for a dishwasher according to claim 1, wherein The water tank (3) is internally fixed with a support at the bottom end, and a stirring device (8) is arranged on the support; the stirring device (8) is connected with a control motor, and the control motor is electrically connected to the controller (14).

4. The heating system for a dishwasher according to claim 1, wherein The water tank (3) is made of a heat-conducting material; the heating wires (5) are wrapped with a heat-insulating material and a high-temperature-resistant protective material.

5. The heating system for a dishwasher according to claim 1, wherein A filter is arranged at the water inlet of the water tank (3), and a descaling agent feeding mechanism is arranged on the upper side of the water tank (3).

6. The heating system for a dishwasher according to claim 1, wherein The water inlet of the dishwasher is connected to the water inlet of the water tank (3), the water outlet of the water tank (3) is connected to a water pump and connected to the water inlet of the spray arm of the dishwasher; and the drain outlet of the dishwasher is connected to the water outlet of the spray chamber (1).

7. The heating system for a dishwasher according to claim 3, wherein A high-temperature-resistant rubber damping pad is arranged between the stirring device (8) and the support.

8. The heating system for a dishwasher according to claim 2, wherein The air outlet of the drying chamber (2) of the dishwasher is connected to the air inlet of the heat exchange device (7), the air outlet of the heat exchange device (7) is connected to the air inlet of the air duct, and circulation is formed.

9. The heating system for a dishwasher according to claim 5, wherein The descaling agent feeding mechanism comprises an upper layer provided with a moisture-proof storage bin (4), the upper end of the storage bin (4) is connected to the charging port of the dishwasher shell, a rotary feeding disc is arranged below the storage bin (4), and a one-way valve is arranged at the connection channel of the descaling agent feeding mechanism and the water tank (3).

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